矿床地质2011，Vol.30Issue(6)：1100-1112,13.
陕西神河钡矿床矿物流体包裹体特征与成矿物理化学条件
Fluid inclusion characteristics and metallogenic physicochemical conditions of Shenhe barium deposit, Shaanxi Province
摘要
Abstract
The Shenhe barium deposit in Shaanxi Province occurs in the northern ore zone of the early Paleozoic South Qinling barium metallogenic belt. Barite and witherite are main ore minerals. Microthermometric analyses show that the homogenization temperature ranges of the fluid inclusions in barite, witherite and barytocalcite are 108 -205°C(with main peak at 130~170°C), 118-274°C (with main peak at 150-210°C) and 146~227°C,respectively, and the salinity ranges of the fluid inclusions in the barite, witherite and barytocalcite zv(NaCleq) are 0.53% ~ 9.86% , 0.18% ~ 8.95 % and 4.03% ~ 7.31 % , respectively. Laser Raman analyses show that the gas and liquid phase composition of the fluid inclusions in barite is H2O, the gas phase compositions of the fluid inclusions in witherite are composed of CO2, N2, H2S and CH4, the gas phase compositions of the fluid inclusions in barytocalcite include CO2 and N2, and the gas phase compositions of the fluid inclusions in quartz consist of CO2, N2, H2S and CH4. It is concluded that metallogenic conditions of various kinds of barium minerals were different. The formation of witherite was possibly associated with thermochemical sulfate reduction, which consumed lots of organic gases and SG4 in hydrothermal fluids and also inhibited the formation of barite when witherite was formed. The authors thus hold that thermochemical sulfate reduction transferred carbon from organic gases into witherite. Relatively high fluid temperatures, the existence of CO2, fairly high Ba + concentrations, and the environment of high HS concentrations and rapid diffusion of H2S in ore-forming fluids before thermochemical sulfate reduction constituted important factors for witherite formation.关键词
地球化学/钡矿床/流体包裹体特征/成矿物理化学条件/神河/陕西Key words
geochemistry, barium deposit, fluid inclusion characteristics, physicochemical conditions for mineralization, Shenhe, Shaanxi Province分类
天文与地球科学引用本文复制引用
吴胜华,刘家军,柳振江,翟德高,邢永亮..陕西神河钡矿床矿物流体包裹体特征与成矿物理化学条件[J].矿床地质,2011,30(6):1100-1112,13.基金项目
本文得到国家自然科学基金(40573032、41173062)、高等学校学科创新引智计划(B07011)、长江学者和教育部创新团队发展计划等项目的资助 （40573032、41173062）
